Robert Krulwich

Every year on Sept. 11, this happens ...

When it gets dark, New York City turns on 88 7,000-watt xenon light bulbs to produce two powerful beams that shoot up, side by side, to remind us that once upon a time, two towers stood here, and then didn't, and this is how we remember the day they came down — by looking up.

When I was a boy I had a globe. I could take it in my hands, rest it on my lap, give it a spin and look down on Africa, Europe, North America and Asia spinning by.

It's a puzzle — the deepest puzzle I know. The question is: What are we?

One answer, from physicist-novelist Alan Lightman, is we are stuff. Just stuff.

What's going on here, I can only guess, but here's what you're about to see: In the video below, the great musician Glenn Gould, supreme interpreter of Bach, is sitting at his living room piano on a low, low chair, his nose close to the keys. He's at his Canadian country house in his bathrobe.

Magic carpets you know about. Aladdin had one. But how about this?

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